<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<title>页面未加载执行失败</title>
		<script type="text/javascript">
			document.getElementById("panel").onclick = function() {
				alert("元素已经加载完毕 !");
			}
			/*
				执行错误，为什么？
				因为dom还未加载完毕。
			*/
		</script>
	</head>

	<body>
		<div id="panel">click me.</div>
	</body>

</html>